When Thabo Sefolosha nailed a back-breaking 3-pointer with just over a minute remaining Wednesday night to give Oklahoma City a four-point edge on Houston, the main question was the usual: Why was no one guarding that guy?

The Rockets have a pretty good answer.

Chandler Parsons was doing his best to get out on Sefolosha, but just one thing was impeding his progress — the mighty arm of the 6-foot-10, 270-pound Kendrick Perkins.

Perkins clearly grabbed hold of Parsons’ arm with two hands and held him as Sefolosha lined up and popped the shot. The Thunder now lead the series 2-0.

Alas, referees sometimes miss calls, even huge ones like this. Check it out in the video below.